.toc {
    margin: 0;
}

header.left .header-inner {
    width: 100%;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    padding-left: 0;
    padding-top: 4rem;
    position: absolute;
}

/*目录字体样式*/
.nav_title h1 {
    padding-left: 1rem;
    position: absolute;
    text-transform: uppercase;
    font-family: 'Economica', sans-serif;
    text-shadow: 1px 2px 5px rgba(0, 0, 0, 0.5);
    -webkit-transition: font-size 0.3s;
    transition: font-size 0.3s;
    vertical-align: middle;
}

.toc ul {
    list-style-type: none;
    padding-left: 20px;
    width: 100%;
}

.toc a {
    text-decoration: none;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
}

/*淡入淡出*/
@-webkit-keyframes fadeIn {
    0% {
        opacity: 0; /*初始状态 透明度为0*/
    }
    50% {
        opacity: 0; /*中间状态 透明度为0*/
    }
    100% {
        opacity: 1; /*结尾状态 透明度为1*/
    }
}

.overflow-content {
    animation: fadeIn 0.5s;
    display: none;
    position: absolute;
    min-width: 100px;
    z-index: 9999;
    color: black;
    padding: 5px 10px 5px 10px;
    text-align: left;
    overflow: visible;
    border-radius: 10px
}

header .vertical-menu li a {
    margin-left: 0;
    padding: 0;
    overflow: hidden;
    -webkit-transition: all 0.3s ease-in-out;
    -moz-transition: all 0.3s ease-in-out;
    transition: all 0.3s ease-in-out;
}


#nav-back-sub {
    position: absolute;
    top: 25px;
    left: 50px;
    text-align: center;
    font-size: 25px;
}